<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avater_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="el-icon-s-goods" type="password"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                     <el-button type="primary" @click="login">登录</el-button>
                      <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return{
            // 这是登录表单的数据绑定对象
            loginForm:{
                username:'admin',
                password:'123456'
            },
            // 这是表单的验证规则对象
            loginFormRules:{
                // 验证用户名是否合法
                username:[
                     { required: true, message: '请输入登录名称', trigger: 'blur' },
                     { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                // 验证密码是否合法
                password:[
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                     { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods:{
        // 点击重置按钮，重置表单
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid =>{
                // console.log(valid);
                if(!valid) return;
                const {data:res} = await this.$http.post('login',this.loginForm);
                if(res.meta.status !== 200) return this.$message.error('登录失败');
                this.$message.success('登录成功');
                // 1.将登陆成功之后的token保存到客户端的sessionStorage中
                //  1.1项目中出了登录之外的其他API接口，必须在登录之后才能访问
                //  1.2token只应在当前网站打开期间生效，所以将其保存在sessionStorage中
                window.sessionStorage.setItem('token',res.data.token);
                // 2.通过编程式导航跳转到后台页面，路由地址是/home
                this.$router.push('/home');
            })
        }
    }
};
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
width: 450px;
height: 300px;
background-color: #fff;
border-radius: 3px;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50% ,-50%);

.avater_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
}
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>